Earlier quoted context omitted.
If something breaks or development stalls or he wants new features and the developer has abandoned the project he can then pick it up himself if he wants.
I'm sure that if he were to abandon Sublime, then he'd open source it. The community is too big not to. Besides, $60 is not a bad price for something that will always be ahead of Lime's curve.
I used closed and open source software. It just feels much better if I see a bug, fix it, place a pull request and be done with it, than discuss with some devs in a bug tracker if and when they want to fix a bug I hate.